{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T18:15:23.048Z","years_from_j2000":26.678,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-112938","name":"HD 112938","class":"a2iv_v_white_subgiant","category":"star","object_type":"A2IV-V white subgiant","mag":7.93,"mag_band":"V","abs_mag":1.267,"abs_mag_band":"V","distance_ly":701.4116842222099,"distance_method":"parallax","ra_deg":195.39758999999998,"dec_deg":-67.856451,"epoch_ra_deg":195.834796,"epoch_dec_deg":-68.001157,"epoch_moved_arcsec":1.115,"pm_ra_mas_yr":-40.75,"pm_dec_mas_yr":-9.3,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Musca","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-112938","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"13016-6751","age_years":372683530,"companions":[{"measured":2016,"magnitude":9.86,"components":null,"discoverer_code":"I   363","separation_arcsec":2.8,"position_angle_deg":190}],"mass_solar":2.42,"radius_solar":2.695,"spectral_type":"A2IV-V","color_index_bv":0.167,"luminosity_solar":27.114400086883105,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2020MNRAS.499.2701M, quality C)","surface_gravity_log_g":3.871,"surface_temperature_k":9750,"proper_motion_ra_mas_yr":-40.75,"proper_motion_dec_mas_yr":-9.3,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":45.5681},"designations":[{"catalog":"HD","designation":"HD 112938"},{"catalog":"HIP","designation":"HIP 63567"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}